Commit a0c1b759 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Linus Torvalds
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hpfs: use mpage 



Use the mpage interface to improve performance.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 3ebacb05

fs/hpfs/file.c

+34 −6
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
 */



#include "hpfs_fn.h"

#include <linux/mpage.h>



#define BLOCKS(size) (((size) + 511) >> 9)
@@ -34,7 +35,7 @@ int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) 
 * so we must ignore such errors.

 */



static secno hpfs_bmap(struct inode *inode, unsigned file_secno)

static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)

{

	struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);

	unsigned n, disk_secno;
@@ -42,11 +43,20 @@ static secno hpfs_bmap(struct inode *inode, unsigned file_secno) 
	struct buffer_head *bh;

	if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;

	n = file_secno - hpfs_inode->i_file_sec;

	if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;

	if (n < hpfs_inode->i_n_secs) {

		*n_secs = hpfs_inode->i_n_secs - n;

		return hpfs_inode->i_disk_sec + n;

	}

	if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;

	disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);

	if (disk_secno == -1) return 0;

	if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;

	n = file_secno - hpfs_inode->i_file_sec;

	if (n < hpfs_inode->i_n_secs) {

		*n_secs = hpfs_inode->i_n_secs - n;

		return hpfs_inode->i_disk_sec + n;

	}

	*n_secs = 1;

	return disk_secno;

}
@@ -67,10 +77,14 @@ static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_he 
{

	int r;

	secno s;

	unsigned n_secs;

	hpfs_lock(inode->i_sb);

	s = hpfs_bmap(inode, iblock);

	s = hpfs_bmap(inode, iblock, &n_secs);

	if (s) {

		if (bh_result->b_size >> 9 < n_secs)

			n_secs = bh_result->b_size >> 9;

		map_bh(bh_result, inode->i_sb, s);

		bh_result->b_size = n_secs << 9;

		goto ret_0;

	}

	if (!create) goto ret_0;
@@ -95,14 +109,26 @@ static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_he 
	return r;

}



static int hpfs_readpage(struct file *file, struct page *page)

{

	return mpage_readpage(page, hpfs_get_block);

}



static int hpfs_writepage(struct page *page, struct writeback_control *wbc)

{

	return block_write_full_page(page, hpfs_get_block, wbc);

}



static int hpfs_readpage(struct file *file, struct page *page)

static int hpfs_readpages(struct file *file, struct address_space *mapping,

			  struct list_head *pages, unsigned nr_pages)

{

	return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);

}



static int hpfs_writepages(struct address_space *mapping,

			   struct writeback_control *wbc)

{

	return block_read_full_page(page,hpfs_get_block);

	return mpage_writepages(mapping, wbc, hpfs_get_block);

}



static void hpfs_write_failed(struct address_space *mapping, loff_t to)
@@ -161,6 +187,8 @@ static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) 
const struct address_space_operations hpfs_aops = {

	.readpage = hpfs_readpage,

	.writepage = hpfs_writepage,

	.readpages = hpfs_readpages,

	.writepages = hpfs_writepages,

	.write_begin = hpfs_write_begin,

	.write_end = hpfs_write_end,

	.bmap = _hpfs_bmap